Late Pleistocene magnitude glacial incursions of southern component water to the deep North Atlantic resolved using Nd isotopes during the intensification of Northern Hemisphere glaciation (3.3 to 2.4 Ma)

Author(s): Lang, D.; Bailey, I.; Wilson, P. A.; Foster, G. L.; Gutjahr, M.
Author Affiliation(s): Primary:
University of Southampton, Southampton, United Kingdom
Volume Title: AGU 2014 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2014; American Geophysical Union 2014 fall meeting, San Francisco, CA, Dec. 15-19, 2014. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: The ocean, through its ability to globally redistribute heat and partition carbon dioxide, is believed to play a key role in driving and amplifying climate change during Quaternary glaciations on orbital to millennial timescales. Relatively little is known, however, about changes in Atlantic Meridional Overturning Circulation (AMOC) associated with the Pliocene intensification of Northern Hemisphere glaciation (iNHG). To help fill this gap in our knowledge we present a new high resolution (∼6 ka) record of the Nd isotope composition of the deep North Atlantic between ∼3.3 and 2.4 Ma, measured on fish debris at IODP Site U1313 (3426 m, 41°N, 32.5°W). This record represents the first orbital-resolution record of variations in watermass mixing in this region for iNHG independent of changes in the carbon cycle and, in contrast to existing benthic foraminiferal δ13C records for this time interval, our Nd dataset contains evidence for late Pleistocene magnitude incursions of Southern Component Waters to the deep North Atlantic Ocean during key glacial periods through this time. We therefore infer an important role for AMOC variability in amplifying Quaternary glacial-interglacial cycles.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Atlantic Ocean; Cenozoic; Expedition 306; Expeditions 303/306; Glacial environment; IODP Site U1313; Integrated Ocean Drilling Program; Mid-Atlantic Ridge; North Atlantic; Pleistocene; Quaternary; Upper Pleistocene
Coordinates: N410000 N410000 W0325700 W0325700
Record ID: 2015104170
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